Make -d flag optional; default to default config when neither -c nor -d is supplied

Agent-Logs-Url: https://github.com/OpenSimulationInterface/qc-osi-trace/sessions/3f67a849-04c8-4ca6-b69f-2c18366a0dfe

Co-authored-by: pmai <91502+pmai@users.noreply.github.com>

Author: Copilot

qc_ositrace/main.py

@@ -18,7 +18,7 @@ def args_entrypoint() -> argparse.Namespace:
         description="ASAM QC checker bundle for checking the validity of OSI Trace (.osi/.mcap) files.",
     )
 
-    group = parser.add_mutually_exclusive_group(required=True)
+    group = parser.add_mutually_exclusive_group(required=False)
     group.add_argument("-d", "--default_config", action="store_true")
     group.add_argument("-c", "--config_path")
 
@@ -95,7 +95,7 @@ def main():
     logging.info("Initializing checks")
 
     config = Configuration()
-    if args.default_config:
+    if args.default_config or not args.config_path:
         logging.info("Using default configuration")
         config.register_checker_bundle(checker_bundle_name=constants.BUNDLE_NAME)
     else: